Open up the back and look for coolant leaks in the CRT's. If you are curious as to what it is, it's the same type of stuff they use to make antifreeze. If you see something wet, it should feel slippery if you get it on your fingers and rub them together.

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The old Mitsubishi units had a super capacitor in the logic circuit instead of a backup battery. This capacitor became leaky over time, causing the problem you describe among others. Number one symptom is set has audio and dark or black picture when powered up. As the super cap charges to full voltage, picture comes and goes.

I have found several of the vertical deflection caps to be off value as well as the vertical chip to be defective.First after pulling the chassis (mark plugs and sockets that have no id numbers with a mark a lot) look with magnifier around vertical and hi section for circuit board cracks that need resoldered.Hope this helps.
Technition

You may need a drive PCB. This PCB can cause the picture to be too bright, no brightness or picture too dark, intermittantly or permanantly. Do check the bulb though and see if it is foggy looking or dull especially if it has not been changed. Thanks for using Fixya.

Hi, did you try a color convergence? I used to work in Best Buy and one of the key things about rear projection TVs and the reason they push those service plans on you is that the tubes/colors need to be calibrated each year. You can do this yourself by checking out the following website: